A series of mixed compounds, ${\mathrm{Co}}_{1-x}{\mathrm{Mn}}_x{\mathrm{V}}_2{\mathrm{O}}_4$, was investigated by strain and magnetization measurements. It was found that a small distortion of the crystal observed in ${\mathrm{CoV}}_2{\mathrm{O}}_4$ $(x=0)$ below the ferrimagnetic ordering temperature $T_{\mathrm{N}}$ persists for $0<x<1$, whereas a structural transition likely accompanied by V orbital ordering occurs as a first-order phase transition at $T_{\mathrm{s}}$ lower than $T_{\mathrm{N}}$ for $0.8\le x<1$ and $T_{\mathrm{N}}$ and $T_{\mathrm{s}}$ merge at $x=1$. These characteristics can be reproduced by a Landau model considering the magnetization $M$, the orbital $Q$, and a quadratic coupling between $M$ and $Q$.

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• Phase diagrams
• Ferrimagnets
• Magnetization measurements
• Thermodilatometry